Resonator-type surface-acoustic-wave filter for reducing the signal strength of a spurious peak
US6255916A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1996 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Feb 7, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6436
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to realize a resonator-type SAW filter permitting higher extra-passband suppressibility by minimizing occurrence of an unwanted spurious peak. A resonator-type SAW filter in which a plurality of SAW resonators each having reflectors and an interdigital transducer and being connected in series and parallel with the other, wherein in at least one of the SAW resonators, particularly in at least one of the SAW resonators connected in series with one another, an inter-electrode pitch .lambda..sub.REF in the reflectors has a different value from an inter-electrode pitch .lambda..sub.IDT in the interdigital transducers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.